首页|Application of Asaoka’s Method in Multistage Triaxial Compression Testing of Normally Consolidated Soils

Application of Asaoka’s Method in Multistage Triaxial Compression Testing of Normally Consolidated Soils

扫码查看
原文链接
  • NETL
  • NSTL
  • Amer Soc Testing Materials
Determination of shear strength parameters becomes a challenge when it is difficult to retrievea minimum of three identical undisturbed soil specimens. In such a situation, multistage triaxialcompression testing can be adopted using a single specimen. Multistage triaxial testing involvesstage-wise consolidation and shearing at three confining pressures without the failureof the specimen until the last stage. A critical issue associated with multistage triaxial testing isthe estimation of ultimate deviator stress and the corresponding pore pressure as the specimenwas not allowed to reach failure in each stage. Conventionally, the failure stress state ineach stage is computed by extrapolating the stress–strain and pore pressure–strain data toa finite strain by employing Kondner’s rectangular hyperbola model. However, it is reportedin the literature that the aforementioned method often overestimates the deviator stress andpore pressure values. In this context, the present study investigates the suitability of Asaoka’sobservational procedure for predicting these values at failure state. The validity of theproposed procedure is verified by comparing the ultimate deviator stress and pore pressurevalues obtained by analyzing the stress–strain data collected from the literature and by performingmultistage triaxial testing on three reconstituted soil samples with that of the rectangularhyperbola method. From the results, it was observed that Asaoka’s method is moresuited for predicting the shear strength parameters. It is believed that the proposed methodologywould aid in obtaining the shear strength parameters of a soil from a single specimen byconducting multistage triaxial testing.

shear strength parametersmultistage triaxial testingrectangular hyperbola methodAsaoka’smethod

K. P. Lijith、R. G. Robinson

展开 >

Department of Civil Engineering,Indian Institute of TechnologyMadras, Sardar Patel Rd., Adyar,Chennai, Tamil Nadu 600036,India

Geotechnical EngineeringDivision, Department of CivilEngineering, Indian Institute ofTechnology Madras, Sardar PatelRd., Adyar, Chennai, Tamil Nadu600036, India

2024

10.1520/GTJ20230555

Geotechnical testing journal

Geotechnical testing journal

SCI
ISSN：0149-6115
年,卷(期)：2024.47(6)
  • 22